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Improving steam power plant efficiency with novel steam cycle treatments

a technology of steam cycle treatment and steam power plant, which is applied in the direction of steam engine plants, steam regeneration, lighting and heating apparatus, etc., can solve the problems of reducing the overall efficiency of the condensation process, reducing the heat transfer resistance of the condensation process, and expensive manufacturing of the condenser tube, so as to improve the overall efficiency of the steam plant and reduce the surface energy coating

Active Publication Date: 2020-09-17
BL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention describes a way to improve the efficiency of a steam power generation plant by adding a chemical called a steam cycle additive to the water or steam cycle. This results in a low surface energy coating on the steam turbine and condenser surfaces, which increases the overall efficiency of the system.

Problems solved by technology

This formed liquid film however, acts as a barrier to additional heat rejection to the cooling working fluid and results in a decrease in the overall efficiency of the condensation process.
It has been previously demonstrated that providing a hydrophobic or low surface energy coating to the condenser in a steam power plant will decrease the heat transfer resistance of the condensation process.
Unfortunately, creation of this surface to date requires costly manufacturing of the condenser tubes to create such a coating prior to installation of the condenser in the plant, or taking the steam plant off-line to retrofit it.
This method also suffers from rapid degradation of the coating under operational conditions, thus rendering it ineffective for long-term improvements in efficiency.
Wet steam flow in steam turbines leads to degraded efficiency and blade erosion in the turbine stages.
Large droplets leave the flow path of the steam and impact the downstream blades causing momentum losses to the turbine.
This means that a part of the impulse of the working medium is not transferred onto the blades, thus resulting in a moisture loss that reduces the degree of efficiency of the low-pressure turbine.
Furthermore, accumulations of water at the inside surfaces of the housing of the low-pressure turbine result in dissipative friction losses on the rotating blade tips and blade shrouds.
However, the challenge has been in the manufacturing and application of the film / coating, as previous applications of such coatings involve manufacturing the steam turbine components with an additional coating or taking the steam power plant off-line to retrofit it.
In addition to adding cost to the steam turbine, operational conditions have proven to destroy the properties of the coating, thus rendering it ineffective for long-term improvements in efficiency.
In addition to steam power plant condensers, industrial turbines can become output limited due to inadequate cooling capacity of the condenser (especially in the hottest months of the year) which increases turbine back pressure and thus increases the amount of condensate formed within the turbine itself.

Method used

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Embodiment Construction

[0021]The invention will now be described in the following detailed description with reference to the drawing(s), wherein preferred embodiments are described in detail to enable practice of the invention. Although the invention is described with reference to these specific preferred embodiments, it will be understood that the invention is not limited to these preferred embodiments. But to the contrary, the invention includes numerous alternatives, modifications and equivalents as will become apparent from consideration of the following detailed description.

[0022]Approximating language, as used herein throughout the specification and claims, may be applied to modify any quantitative representation that could permissibly vary without resulting in a change in the basic function to which it is related. Accordingly, a value modified by a term or terms, such as “about”, is not limited to the precise value specified. In at least some instances, the approximating language may correspond to ...

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Abstract

A process for improving the efficiency of a steam power generation plant, the process providing utilizing steam or water from a steam cycle of a steam power plant; and supplying a steam cycle treatment to the steam cycle, thereby generating a hydrophobic coating within the steam cycle.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority benefit of U.S. Provisional Patent Application Ser. No. 62 / 589,101 filed Nov. 21, 2017, the entirety of which is incorporated herein by reference.BACKGROUND OF THE INVENTIONField of Invention[0002]The present invention relates to methods and compositions for improving steam power plant efficiency, and more particularly, to improving steam power plant efficiency through the use of novel steam cycle additives or treatment.Description of Related Art[0003]In steam generating systems, such as power plants, condensers are used to convert steam from a gas to a liquid, after it has passed through a steam turbine. Different forms of condensers are used where the heat from the condensing steam is rejected to a gas, as in an air cooled condenser (ACC), or to a liquid, as in a water cooled condenser (WCC). In a WCC, the condenser comprises a large number of condenser tubes through which the water passes and the st...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01K19/00F01K13/00F28B1/02
CPCF28B1/02F01K13/006F01K19/00
Inventor DALE, TREVOR JAMESROBINSON, GREGORY J.ROBINSON, JAMESROSSI, ANTHONY M.TROSSBACH, ROBERT
Owner BL TECH INC
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